WARTS. 



365 



epidermic cells by contact with the unaltered cuticle, are equallv 

 capable, before their migration, of serving for the development of 

 connective tissue. The details of the process are well shown in 

 a fine section through the apex of a rapidlj-growing papilla of 

 the skin (fig. 116). The boundary-line between connective 

 tissue and epithelium appears very distinct at the sides of the 

 papilla, where the small yellowish cells of the rete Malpighii 

 are implanted in the fibrous texture of the papillary body, 



Fig. 116. 







Oo 



J Jl^l 



0^0 i 



4 





A hyperplastic papilla of the cutis -with its epithelium. I'roiii 

 the neighbourhood of an epithelioma of the lip. 



as described in treatises on normal histology. As we 

 approach the apex of the papilla, this boundary-line fades and 

 disappears ; for on the one hand, the rounded cells of the con- 

 nective tissue accumulate at the expense of the intercellular 

 substance, while, on the other, the epithelial elements pass by 

 slow gradations from these rounded forms, through a more 



